If you teach a bunch of one child per family spoiled brats in China who show you no respect and distract the few students who actually WANT to learn, here's a game that they can play which will show them the meaning of the word "sarcasm" and let them know how you feel about their behavior. It also acts as a good release valve for your seething rage. Simply write "find the sarcasm" at the top of the board, then write four sincere and innocuous statements along with one sarcastic sentence. For example, "I find the respect you show me by sleeping in class to be very gratifying".